Also You’ll notice that the Enterprise crew that are wearing the standard Federation uniforms for that series are all listed as blue. Blue was the base color, the stripes are what designated roles which you can see in the pictures. Captain was gold, Security Red, etc…

If you click the source link and then on the picture there, you’ll get to the corrected version:http://www.chartgeek.com/star-trek-characters/
(I think someone shoud change the picture here on GAS to the corrected one – my eyes hurt, when I see Star Trek chart messed up like that… :P)